q6asol - H omework Quiz#6A solution outline(a(i In the...

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3.091 Fall Term 2004 Homework Quiz #6A solution outline (a) (i) In the cubic unit cell below sketch (030). (ii) In the cubic unit cell below sketch [030]. y z x y z x (b) Calculate the density of atoms in (011) in iridium (Ir). Express your answer in units of atoms/cm 2 . Ir is FCC. (011) is the cube diagonal, a rectangular area of a × 2 ½ a . There are atoms at the four corners of the rectangle which are shared with adjacent unit cells; only ¼ of the area of each corner atom lies within the rectangle. In addition, there are atoms along each of the long sides of the rectangle (these are the atoms at the center of the upper and lower faces); only ½ of the area
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